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Doctor's Assessment Included

Every result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.

Allergy & Intolerance

Histamine

Histamine blood testing provides insight into mast cell activity and immune reactivity. Combined with DAO and tryptase testing, it forms a comprehensive assessment of histamine-related conditions.

What It Measures

This test measures the concentration of histamine in your blood. Histamine is released primarily by mast cells and basophils during immune responses. Plasma histamine has a short half-life, so blood must be processed carefully to avoid false elevations.

Why It Matters

Measuring blood histamine helps assess mast cell activity. It can support the diagnosis of anaphylaxis, mastocytosis, and histamine-related conditions. Pairing histamine with DAO and tryptase testing provides a more complete picture of histamine metabolism.

When to Test

Histamine testing may be useful if you experience unexplained allergic-type symptoms, suspected anaphylaxis, or symptoms suggestive of mast cell disorders. Blood should ideally be drawn during or shortly after a symptomatic episode. Consult your healthcare provider for timing guidance.

Symptoms

Low Levels

Low histamine levels are generally considered normal and not associated with specific clinical symptoms.

High Levels

Elevated blood histamine may be associated with flushing, hives, itching, headache, rapid heartbeat, low blood pressure, abdominal cramps, and in severe cases anaphylaxis. Chronic elevation may suggest mastocytosis or histamine intolerance.

Lifestyle Tips

If histamine-related symptoms are identified, a low-histamine diet may help reduce symptom burden. Keeping a symptom diary helps identify triggers. Antihistamines may be recommended by your healthcare provider. Avoid known triggers and carry emergency medication if prescribed.

Frequently Asked Questions

How is blood histamine different from DAO testing?
Blood histamine measures the actual level of histamine in your blood, while DAO measures the enzyme that breaks histamine down. Together they provide a more complete picture of histamine metabolism.
Can certain foods raise blood histamine?
Yes. Histamine-rich foods and histamine-releasing foods can increase blood histamine levels. However, blood histamine testing is usually done to assess mast cell activity rather than dietary histamine.
Why does blood handling matter for this test?
Histamine can be released from blood cells during collection and processing, causing falsely elevated results. Proper sample handling with rapid centrifugation and cooling is essential for accurate results.